https://preparationpoint.info/mathematics-mcqs/basic-maths-mcqs/12-buckets-of-water-fill-a-tank-when-the-capacity-of-each-bucket-is-13-5-litres-how-many-buckets-will-be-needed-to-fill-the-same-tank-if-the-capacity-of-each-bucket-is-9-litres/